oracle切割以，隔开的数字字符串

提前声明strsplit_type
CREATE OR REPLACE TYPE strsplit_type as table of varchar2(4000);

如果不，会报错：
PLS-00201: 必须声明标识符 'strsplit_type'

--strsplit 数据：2，4，5，6，7，8，9

 1 create or replace function strsplit(p_value varchar2,
                                     p_split varchar2 := ',')

  return strsplit_type
   pipelined is
   v_idx       integer;
   v_str       varchar2(500);
   v_strs_last varchar2(4000) := p_value;

 begin
   loop
     v_idx := instr(v_strs_last, p_split);
     exit when v_idx = 0;
     v_str       := substr(v_strs_last, 1, v_idx - 1);
     v_strs_last := substr(v_strs_last, v_idx + 1);
     pipe row(v_str);
   end loop;
   pipe row(v_strs_last);
   return;

 end strsplit;

 create or replace function split(p_value varchar2,p_sep varchar2 := ',')
 --usage: select * from table(strsplit('1,2,3,4,5'))
  return type_split
   pipelined is
   v_idx       integer;
   v_str       varchar2(500);
   v_strs_last varchar2(4000) := p_value;

 begin
   loop
     v_idx := instr(v_strs_last, p_value);
     exit when v_idx = 0;
     v_str       := substr(v_strs_last, 1, v_idx - 1);
     v_strs_last := substr(v_strs_last, v_idx + 1);
     pipe row(v_str);
   end loop;
   pipe row(v_strs_last);
   return;

 end split;